Means for preventing singling in spinning operations



Oct. 31, 1950 J. c. BOYD MEANS FOR PREVENTING smaunc IN SPINNING OPERATIONS Filed May 23, 1949 INVENTOR. 'fisEPH C. BOYD Patented Oct. 31, 1950 MEANS FOR PREVENTING SINGLING IN SPINNING OPERATIONS Joseph Cecil Boyd, Laurens, S. (1., assignor, by

direct and mesne assignments, to Dodenhoff, Greenville, S. C.

William D.

Application May 23, 1949., Serial No. 94,806

6 Claims. (CL 57-86) This invention relates to an attachment for spinning frames of the type wherein two or more strands of yarn are, carried along parallel paths to a point where they are brought together and twisted to form a finished thread and the object of the invention is to provide means for preventing singling in the manufacture of the thread.

This application is a continuation in part of my copending application Serial No. 89,988 filed April 27, 1949 and like that application has for its primary object to provide means for automatically severing the second strand of yarn if the first strand accidentally breaks and to do this through 'the medium of instrumentalities which -are so sensitive in operation that they will carry out their functions without themselves imposing any such additional strain on the yarns as tend to cause them to break.

The present application adds to the structure of my parent application means whereby the act of threading new lengths of yarn through the would guides, preparatory to a resumption of operations, automatically resets to proper, yarn engaging position the severing means hereinafter described.

lers by which the threads are engaged and fed;

and

Fig. 5 is a detail viewof a modified form of trip rod hereinafter described.

I Like numerals designate corresponding parts throughout the several figures of the drawing.

' In the drawing, 5 designates the two strands of yarn which are to be twisted together. Disposed in the path of movement of these strands of yarn is the device of my invention which comprises a base plate 8 which together with walls 80. and 812 comprises a pair of elongated loops 9 and Ill. Relatively slender elongated. trip rods l I and l 2 are pivotally mounted at it and i i upon the opposite faces of the plate '8. carry inwardly facing sharp, fine, teeth 55 and [6. Guide channels I7 and is for the strands 'of yarn are formed complementally in the three plates, 8, 8a and 8b. The yarn is drawn through these guide channels by rollers 1. This is best illustrated in Figs. 1 and 4. lhe pivotal mounting of the lower ends of the rods H and i2 adapt these rods to swing across the elongated loops 9 and it from the full line position illustrated in These rods r 2 Fig. 1 to the dotted line positions there indicated, these dotted line positions illustrating the movements of the rod IE, it being understood that the movement of the rod ll corresponds thereto but in the opposite direction. I

When the rod [2 is in the dotted line position illustrated at lia in Fig. 1, said rod rests against the strand of yarn 5 and is held against further movement toward the left. However, if that strand should break, then the rod will fall by gravity toward the left until the fine sharp oomb-like teeth engage the other strand 5 and cause its breakage. vice and the small amount of strain which is imposed upon the yarn flows primarily from the .fact that the point of pivoting l3 and is of the rodsis such that when said rods are in the full line position in Fig. 1 they lie outwardly of a vertical line drawn through the point of pivoting but when they are in the. position illustrated at 52a they lie inwardly of a vertical line drawn through the point of pivoting and thus tend to fall by gravity in a direction to cause them to far enough for the teeth to acquire considerable momentum, withtheresult that the teeth are plunged firmly into the unbroken strand of yarn and in a manner to hold and sever the same. Thus while the engagement ofthe rods with the strands or yarn is very light and delicate until the time of action arrives,'yet when such time arrives the action is very positive and effective.

The trip IOds or wires of this application differ from the like elements of the parent application aforesaid in that they carry lateral extensions or knees 12c of such shape that they lie across the guide channels I? and is so thatas long as the trip rods are tipped outwardly of. the vertical the yarn will rest upon these extensions. When the yarn is put under tension, as the rollers .1 start to draw the yarn through the guide chan- Thus the yarn does not have to bear the weight of the trip rods. The extensions 1 2e may be separate pieces secured to mere straight rods, as in Fig. 1 or they may be formed in the bending of the rod as at l2 in Fig, 5. Or these parts may be stampings of metal, plastic or any other suitable material.

The sensitivity of the de-' Another respect in which the present application differs from my parent application aforesaid is in the manner in which the housing comprised by base plate 8 and walls 8a and 8b are carried upwardly far enough to house the fine, sharp teeth I5 and [6 of the trip rods. This guards against the possibility that the operator will be injured by these teeth.

I am aware of the fact that it has heretofore been proposed to provide pivoted toothed members riding upon strands of yarn and acting when one of said strands breaks to permit a toothed member to engage the other strand for the purpose of breaking the same and thus to prevent singling. However, all of the devices with which I am familiar are so constructed that the yarn strands which are, themselves, none too strong have had to support the weight of the toothed elements in a way wholly different from that which is proposed under the present construction. Not only are the elements which go to makeup the device of the present invention extremely simple and inexpensive but they act more effectively and with less strain upon the yarn than with any known device with which I am familiar.

While it is an easy matter to move the rods I i and I2 to the full line positions illustrated in Fig. 1 by merely grasping the upper ends of the rods,

I may, if desired, provide'means for simultaneously moving these rods to the full line positions illustrated. One way of accomplishing this has been illustrated, consisting of a slide mounted to move in a slot 2|. This slide has extensions 22 adapted to underlie and engage projecting pins v U 23 upon the hubs 24 of the rods ii and 12. A 5

spring 25 may be employed to draw the slide downwardly. When the slide is thrust upwardly by grasping its knob 26 its extensions engage the pins and swing the rods outwardly. To further insure the movement of the toothed rod to past center yarn engaging position, I may provide a guide rod 30 beneath which the yarn or roving is threaded so that the roving does not enter in a straight horizontal direction but is carried upwardly over the knees Hat on its way to feed rollers 1. Thus as these rollers impose drawing action upon the roving said roving exerts a downward thrust on the knees.

I wish it to be understood that the invention Having described my invention what claim is:

1. A device for preventing singling comprising a support, a pair of elongated upstanding members, pivoted at their lower ends to said support, yarn engaging and breaking teeth projecting inwardly from said members adjacent the upper portions thereof, and a pair of yarn guideways lying between said members, the point of pivoting of said members being such that the upstanding members engage the sides of runs of yarn traveling through said guideways with said upstanding members tipped slightly past center toward said guides and means upon said members and engageable by the yarn for automatically moving said members to past center position and against the yarn under the influence of tension upon the yarn.

2. A device for preventing singling comprising a support, a pair of elongated upstanding members, pivoted at their lower ends to said support, yarn engaging and breaking teeth projecting inwardly from said members adjacent the upper portions thereof, and a pair of yarn guideways lying between said members, the point of pivoting of said members being such that the upstanding members engage the sides of runs of yarn traveling through said guideways with said upstanding members tipped slightly past center toward said guides, and extension'portions upon said members which extend across the yarn guideways above the level of the bottom of the guideways, as long as the members are tipped beyond the vertical away from the yarn, the pressure of the yarn when placed under tension acting upon said extensions to move the members to past center position and toward the yarn.

3. A device for preventing singling comprising a support, a pair of elongated upstanding members, pivoted at their lower ends to said support, yarn engaging and breaking teeth projecting inwardly from said members adjacent the upper portions thereof, and a pair of yarn guideways lying between said members, the point of pivoting of said members being such that the upstanding members engage the sides of runs of yarn traveling through said guideways with said upstanding members tipped slightly past center toward said guides, and portions upon said members which extend across the yarn guideways above the level of the bottom of the guideways, as long as the members are tipped beyond the vertical away from the yarn, the pressure of the yarn when placed under tension acting upon said extensions to move the members to past center position and toward the yarn and means carried by the support for housing said teeth when they are tipped outwardl beyond the vertical.

4. A device of the character described the combination with a support carrying a pair of spaced guideways of means for drawing strands of yarn to be twisted through said guideways, a pair of toother trip rods pivoted in such relation to the guides that when said rodsstand nearly upright with the strands of yarn riding past their sides they are tipped to less than 10 from the vertical, groups of sharp, fine, yarn piercing teeth projecting from the confronting faces of said rods, and extensions projecting from said rods across the guideways of such shape that said extensions lie above the working face of the guideways as long as the rods are tipped away from the guideways beyond the vertical, said extensions moving below the level of the working faces of the guideway to permit the latter to receive the yarn when the rods are tipped beyond the vertical toward the opposing guideway. 5. A structure as recited in claim 1 in combination with means for drawing said yarn through said guides and an additional guiding means so positioned with respect to the drawing means that the yarn is caused to pass over the means upon the members with a change of direction which increases the thrust of the yarn upon said means as the drawing means exerts pull upon the yarn.

6. A structure as recited in claim 5 in combination with a pair of feed rollers mounted at one side of the support and acting to draw the runs of yarn through the yarn guideways and a guide bar located at that side of the support remote from the rollers, with which the yarn engages, said bar being located below the level of the yarn guideways.

JOSEPH CECIL BOYD.

No references cited. 

